EC-25 LTE: AT+QCFG="nwscanmode",3

I have an EC25 module with firmware EC25EFAR06A11M4G

I’m using a combination of

to restrict the modem to scanning in LTE only and on the whole, this is working very well.
However, on a few units, an
AT+QCFG=“nwscanmode”,3 write results in a read of
+QCFG: “nwscanmode”,0

So despite LTE bands being defined, the scan set to LTE (3) as the final write, the read defaults to auto (0) and LTE fails to work.
Neither GSM or UMTS have this issue.
The modem is used as part of a test system so we are programming the AT commands many times and changing RATs many times too. Any ideas as to why this might be happening?

Hello PG thanks for your question
If you want change RAT, you can execute at+qcfg=“nwscanmode” command, do not need execute at+qcfg=“band”, the command is used to specify the preferred frequency bands to be searched of UE.


I’m facing similar issue on my EC21-E on the last days. It suddenly avoids to enable the nwscanmode=3 (LTE only)
After writing, I query status again and:
AT+QCFG=“nwscanmode” is 0

Any clue? That’s making that I’m connected to WCDMA radio access only, and not LTE any more.



I have reverted back to using auto and taking the time hit that it will scan other RATs too. If your system is cabled up for testing that helps.